FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/astenc.c
Date: 2026-05-04 20:54:34
Exec Total Coverage
Lines: 65 78 83.3%
Functions: 3 3 100.0%
Branches: 19 36 52.8%
Line Branch Exec Source
1 /*
2 * AST muxer
3 * Copyright (c) 2012 James Almer
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "avformat.h"
23 #include "avio_internal.h"
24 #include "internal.h"
25 #include "ast.h"
26 #include "mux.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29
30 typedef struct ASTMuxContext {
31 AVClass *class;
32 int64_t size;
33 int64_t samples;
34 int64_t loopstart;
35 int64_t loopend;
36 int fbs;
37 } ASTMuxContext;
38
39 #define CHECK_LOOP(type) \
40 if (ast->loop ## type > 0) { \
41 ast->loop ## type = av_rescale_rnd(ast->loop ## type, par->sample_rate, 1000, AV_ROUND_DOWN); \
42 if (ast->loop ## type < 0 || ast->loop ## type > UINT_MAX) { \
43 av_log(s, AV_LOG_ERROR, "Invalid loop" #type " value\n"); \
44 return AVERROR(EINVAL); \
45 } \
46 }
47
48 1 static int ast_write_header(AVFormatContext *s)
49 {
50 1 ASTMuxContext *ast = s->priv_data;
51 1 AVIOContext *pb = s->pb;
52 1 AVCodecParameters *par = s->streams[0]->codecpar;
53 unsigned int codec_tag;
54
55
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 1 if (par->codec_id == AV_CODEC_ID_ADPCM_AFC) {
56 ✗ av_log(s, AV_LOG_ERROR, "muxing ADPCM AFC is not implemented\n");
57 ✗ return AVERROR_PATCHWELCOME;
58 }
59
60 1 codec_tag = ff_codec_get_tag(ff_codec_ast_tags, par->codec_id);
61
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 1 if (!codec_tag) {
62 ✗ av_log(s, AV_LOG_ERROR, "unsupported codec\n");
63 ✗ return AVERROR(EINVAL);
64 }
65
66
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 1 if (ast->loopend > 0 && ast->loopstart >= ast->loopend) {
67 ✗ av_log(s, AV_LOG_ERROR, "loopend can't be less or equal to loopstart\n");
68 ✗ return AVERROR(EINVAL);
69 }
70
71 /* Convert milliseconds to samples */
72
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 1 CHECK_LOOP(start)
73
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 1 CHECK_LOOP(end)
74
75 1 ffio_wfourcc(pb, "STRM");
76
77 1 ast->size = avio_tell(pb);
78 1 avio_wb32(pb, 0); /* File size minus header */
79 1 avio_wb16(pb, codec_tag);
80 1 avio_wb16(pb, 16); /* Bit depth */
81 1 avio_wb16(pb, par->ch_layout.nb_channels);
82 1 avio_wb16(pb, 0); /* Loop flag */
83 1 avio_wb32(pb, par->sample_rate);
84
85 1 ast->samples = avio_tell(pb);
86 1 avio_wb32(pb, 0); /* Number of samples */
87 1 avio_wb32(pb, 0); /* Loopstart */
88 1 avio_wb32(pb, 0); /* Loopend */
89 1 avio_wb32(pb, 0); /* Size of first block */
90
91 /* Unknown */
92 1 avio_wb32(pb, 0);
93 1 avio_wl32(pb, 0x7F);
94 1 avio_wb64(pb, 0);
95 1 avio_wb64(pb, 0);
96 1 avio_wb32(pb, 0);
97
98 1 return 0;
99 }
100
101 11 static int ast_write_packet(AVFormatContext *s, AVPacket *pkt)
102 {
103 11 AVIOContext *pb = s->pb;
104 11 ASTMuxContext *ast = s->priv_data;
105 11 AVCodecParameters *par = s->streams[0]->codecpar;
106 11 int size = pkt->size / par->ch_layout.nb_channels;
107
108
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 11 if (s->streams[0]->nb_frames == 0)
109 1 ast->fbs = size;
110
111 11 ffio_wfourcc(pb, "BLCK");
112 11 avio_wb32(pb, size); /* Block size */
113
114 /* padding */
115 11 ffio_fill(pb, 0, 24);
116
117 11 avio_write(pb, pkt->data, pkt->size);
118
119 11 return 0;
120 }
121
122 1 static int ast_write_trailer(AVFormatContext *s)
123 {
124 1 AVIOContext *pb = s->pb;
125 1 ASTMuxContext *ast = s->priv_data;
126 1 AVCodecParameters *par = s->streams[0]->codecpar;
127 1 int64_t file_size = avio_tell(pb);
128 1 int64_t samples = (file_size - 64 - (32 * s->streams[0]->nb_frames)) / par->block_align; /* PCM_S16BE_PLANAR */
129
130 1 av_log(s, AV_LOG_DEBUG, "total samples: %"PRId64"\n", samples);
131
132
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 1 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
133 /* Number of samples */
134 1 avio_seek(pb, ast->samples, SEEK_SET);
135 1 avio_wb32(pb, samples);
136
137 /* Loopstart if provided */
138
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 1 if (ast->loopstart > 0) {
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 1 if (ast->loopstart >= samples) {
140 ✗ av_log(s, AV_LOG_WARNING, "Loopstart value is out of range and will be ignored\n");
141 ✗ ast->loopstart = -1;
142 ✗ avio_skip(pb, 4);
143 } else {
144 1 avio_wb32(pb, ast->loopstart);
145 }
146 } else {
147 ✗ avio_skip(pb, 4);
148 }
149
150 /* Loopend if provided. Otherwise number of samples again */
151
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 1 if (ast->loopend && ast->loopstart >= 0) {
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 1 if (ast->loopend > samples) {
153 ✗ av_log(s, AV_LOG_WARNING, "Loopend value is out of range and will be ignored\n");
154 ✗ ast->loopend = samples;
155 }
156 1 avio_wb32(pb, ast->loopend);
157 } else {
158 ✗ avio_wb32(pb, samples);
159 }
160
161 /* Size of first block */
162 1 avio_wb32(pb, ast->fbs);
163
164 /* File size minus header */
165 1 avio_seek(pb, ast->size, SEEK_SET);
166 1 avio_wb32(pb, file_size - 64);
167
168 /* Loop flag */
169
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 1 if (ast->loopstart >= 0) {
170 1 avio_skip(pb, 6);
171 1 avio_wb16(pb, 0xFFFF);
172 }
173
174 1 avio_seek(pb, file_size, SEEK_SET);
175 }
176 1 return 0;
177 }
178
179 #define OFFSET(obj) offsetof(ASTMuxContext, obj)
180 static const AVOption options[] = {
181 { "loopstart", "Loopstart position in milliseconds.", OFFSET(loopstart), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
182 { "loopend", "Loopend position in milliseconds.", OFFSET(loopend), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
183 { NULL },
184 };
185
186 static const AVClass ast_muxer_class = {
187 .class_name = "AST muxer",
188 .item_name = av_default_item_name,
189 .option = options,
190 .version = LIBAVUTIL_VERSION_INT,
191 };
192
193 const FFOutputFormat ff_ast_muxer = {
194 .p.name = "ast",
195 .p.long_name = NULL_IF_CONFIG_SMALL("AST (Audio Stream)"),
196 .p.extensions = "ast",
197 .priv_data_size = sizeof(ASTMuxContext),
198 .p.audio_codec = AV_CODEC_ID_PCM_S16BE_PLANAR,
199 .p.video_codec = AV_CODEC_ID_NONE,
200 .p.subtitle_codec = AV_CODEC_ID_NONE,
201 .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
202 .write_header = ast_write_header,
203 .write_packet = ast_write_packet,
204 .write_trailer = ast_write_trailer,
205 .p.priv_class = &ast_muxer_class,
206 .p.codec_tag = ff_ast_codec_tags_list,
207 };
208